This got my attention listening to KPWK tower this morning. Apparently a Citation crossed the hold short lines without clearance, or did I hear that incorrectly? Either way, this controller's a very nice guy. I talk to him all the time at KPWK.

I'm guessing he was at the wrong hold short line. Maybe like this guy (from Google Maps). Here you can see an aircraft at the hold short line for 12-30 & 6-24. (The "runway behind 34" He needs to scoot up a bit to get to runway 34.

What makes you think the aircraft that is at the hold short line is stopped? It is likely taxiing to runway 34 for takeoff and not stopped on the wrong side of the hold short bar for the wrong runway.

Does it matter? It illustrates the point in a very good way, for me it wasn't immediately evident that in the sentence "those are the hold short lines for the runway behind you", "behind you" was referring to the runway, not the hold short lines, the picture made it abundantly clear and now when I listen to the clip I can no longer not hear the intonation implying the runway rather than the hold short lines.

You guys are right. I was 'listening' to it wrong. But how does somebody who is instrumented rated hold short at the wrong bar when the big red runway identifier decal is only going to be on the safe side? Did he like think the runway number was upside down and labeled with the wrong runway was just some bizarre coincidence?

I'm guessing he was at the wrong hold short line. Maybe like this guy (from Google Maps). Here you can see an aircraft at the hold short line for 12-30 & 6-24. (The "runway behind 34" He needs to scoot up a bit to get to runway 34.

Agree... Further supported by the fact that the next words out of the controller's mouth are "Cross those, 7SF..." If the aircraft had already crossed the wrong lines, it wouldn't make sense for the controller to tell him, in the next breath, to "cross those..."